Law enforcement officials are questioning a man in New Boston, Texas about threatening letters believed to contain ricin sent to President Obama, New York City Mayor Michael Bloomberg and a gun control group. Ed Lavandera has more on the investigation.

Lavandera reports that all three letters contained this threatening message: “You will have to kill me and my family before you get my guns. Anyone wants to come to my house will be shot in the face. The right to bear arms is my constitutional God-given right and I will exercise that right 'til the day I die. What's in this letter is nothing compared to what I’ve got planned for you."

“This latest round of threats has many wondering if ricin is becoming the weapon of choice for intimidation,” Lavandera says. Former New York City Police Commissioner Bill Bratton says, "Ricin is probably one of the worst ways to try and kill somebody. So I don't see it as a real threat in the sense of an actual capability to kill, but rather, to intimidate and attract publicity."

An intense manhunt is underway for one, or possibly two suspects, after an assistant district attorney was gunned down outside a courthouse in Texas. Mark Hasse, a prosecutor in Kaufman County, located about 30 miles outside Dallas, was killed after being shot several times as he got out of his car in the courthouse parking lot yesterday.

Authorities are pleading for leads. The FBI is now helping in the case. Drew Griffin is live in Kaufman, Texas this morning with more.

The investigation into the sex scandal between Former CIA Director David Patraeus and his former biographer Paula Broadwell continues. The FBI searched Broadwell's home last night, but new questions have emerged about the FBI agent who launched the investigation. There are also questions about why FBI was involved at all.

Meanwhile, congressional leaders have spoken out about why they were not alerted about the affair earlier. Fmr. FBI Assistant Director and CNN Contributor Tom Fuentes joins Zoraida Sambolin live from Washington D.C. to discuss the latest in the investigation on “Early Start”.

The FBI has referred the case to the Defense Department, raising more questions about their involvement. “It suggests that they only see something that’s gonna be internal to military, potentially military violations, as opposed to criminal conduct that could be prosecuted in regular criminal court, or security breaches that are also, would be a violation,” Fuentes explains.

The Army will investigate the case and “determine what they can find and how they wanna proceed, whether the charges are unfounded, or whether it turns out they wanna have a court martial, or refer it back to the FBI,” he adds.

Alina Cho gives the latest on missing FBI agent Stephen Ivens who was last seen Thursday night by his wife. 100 FBI agents and dozens more law enforcement officers have been on a manhunt to find Ivens who is said to be despondent and possibly suicidal.